package edu.nf.takeoutdemo.commons.aspect;

import edu.nf.takeoutdemo.commons.annotation.AutoFill;
import edu.nf.takeoutdemo.commons.constant.AutoFillConstant;
import edu.nf.takeoutdemo.commons.context.BaseContext;
import edu.nf.takeoutdemo.commons.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 *
 * @author zjl
 * @date 2025/10/25
 * 自定义切面，实现公共字段的自动填充处理逻辑
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {

    /**
     * 切入点
     */
    @Pointcut("execution(* edu.nf.takeoutdemo.mapper.*.*(..)) && @annotation(edu.nf.takeoutdemo.commons.annotation.AutoFill)")
    public void autoFillPointCut() {

    }

    /**
     * 前置通知，在通知中进行公共字段的赋值
     */
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) {
        log.info("开始进行公共字段的自动填充...");

        //获取当前被拦截的方法上的数据库操作类型
        //方法签名对象
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        //获得方法上的注解对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);
        //获得数据库操作类型
        OperationType operationType = autoFill.value();
        //获取到当前被拦截方法的参数--实体对象
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0) {
            return;
        }
        Object entity = args[0];
        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
        //根据当前不同的操作类型，为对应的属性通过反射来赋值
        try {
        Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
        Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
        Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
        Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
        if (operationType == OperationType.INSERT) {
            //为4个公共字段赋值
                //通过反射为对象属性赋值
                setCreateTime.invoke(entity,now);
                setUpdateTime.invoke(entity,now);
                setCreateUser.invoke(entity,currentId);
                setUpdateUser.invoke(entity,currentId);
        }else if (operationType == OperationType.UPDATE) {
            //为2个公共字段赋值
            setUpdateTime.invoke(entity,now);
            setUpdateUser.invoke(entity,currentId);
        }
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}
